Question 5 - A-Level Maths

Exam Board	Edexcel
Module	S2 (Statistics 2)
Year	2012
Session	January
Topic	Poisson Distribution
Type	Multiple periods with binomial structure

The probability of an electrical component being defective is 0.075 The component is supplied in boxes of 120
1. Using a suitable approximation, estimate the probability that there are more than 3 defective components in a box.
A retailer buys 2 boxes of components.
Estimate the probability that there are at least 4 defective components in each box.